CMOs, what do you think is the most important skill you should be focused on personally in order to avoid turnover and build long-term tenure at an organization?

We recently launched an internal news app to keep employees informed and connected to what's happening in the company.  I’d love to learn from your experiences what best practices or creative tactics worked well for sustained engagement? Any lessons learned or pitfalls to avoid? Our goal is to make this a go-to channel for company news and updates, so any advice or examples would be greatly appreciated!